This is an original  Grumman F6F Hellcat Type VSI Vertical Speed Indicator Gauge Instrument .The type used in the Grumman F6F Hellcat Fighter and other aircraft.  It was also used in the F4U Corsair and the F4F Wildcat.     It is 3 1/4 x 3 1/4 x 6 inches.  This gauge would also have been used in almost every type of US bomber, transport, trainer, and fighter aircraft such as the SBD, SB2C, OS2U, P-51, P-47, B-25, P-38, A-24, A-20, B-17 , B-24 Etc. This item is being sold as a collectable.Payment should be received within 10 days of auction closing unless prior arrangements have been made. Buyer to pay actual shipping.  AZ residents add 6.7% sales tax. Thanks for looking at my auction.